gdp's Comments

Skis / Toys / Fun : Does it all devolve?

Fri, 22 Oct 2010 14:32:49 +0000

Not sure how it helps, still allows for people to construct monolithic code. Most of the add on services for AWS are things people tack on anyway [Database, Email, Static File Serving]. Not the idea of components, plugins and small lightweight pieces.

Skis / Toys / Fun : Zend Framework vs. Django Performance

Fri, 22 Oct 2010 06:08:08 +0000

Trivia - moved from lighttpd to tornado for an app and dropped the latency by 40ms.

Skis / Toys / Fun : Python wierdness

Tue, 31 Aug 2010 03:55:46 +0000

Oh! That's a perspective I hadn't thought of ... class initializer values. Rather than class scoped variables.

Skis / Toys / Fun : Web 2.0 development - C++ vs. Java vs. PHP vs. Python

Wed, 2 Sep 2009 15:28:06 +0000

If you're new to programming the pain in learning two languages is huge, not only that but the level of detail that's needed for C++ will be quite frustrating. You should have no problem building just about anything in PHP for the web.

Skis / Toys / Fun : Facebook vs. Google

Tue, 9 Jun 2009 03:02:42 +0000

Wave feels more like Threaded Groups meets IM. Since based on the demos once you start a discussion you can only refine the discussion or forward it to others -- create new sub conversations. It has some cool/wow factor, but at the end of the day it's just another tool. FB by having distinct "entities" for friendable entities vs. fanable entities makes the service feel a little bit more disjoint. I'm a fan of "Ashton Kutcher" (not) but I might also be one of his friends, why do I need to treat the two entities as distinct. You do make a good point about having different circles of friends on different services, FB has minimal ways to manage your groups of friends. If it was more first class it would probably make things more interesting. That way you can assign a Friend Group to a 3rd party service and that's the circle of friends that would be seen/visiable/accessible on that service.

Skis / Toys / Fun : Content agregation vs. Human Editors

Wed, 3 Jun 2009 03:17:33 +0000

That's part of the idea, but I think part of it is making is a "first tier" experience. Netvibes has a similar feature. But, fundamentally I think there should an "editors" blog portal similar to bloglines.com or wordpress.com where you can build a cross blog content aggregation.

Skis / Toys / Fun : Array Intersection Bake-off

Tue, 19 May 2009 15:49:19 +0000

Preallocation is a good trick... Brought the runtime down to 2.092 seconds!

Skis / Toys / Fun : Array Intersection Bake-off

Mon, 18 May 2009 15:45:35 +0000

Cool, thanks. Performance comparison: Perl #1 - 3.227 Perl #2 - 3.702 Perl #3 - 3.091 So, it appears that somebody might want to optimize Array::Util a bit more... In playing with this, since it didn't make sense why Array::Util should be slower found the following "faster" version. Which shows that the "map" call is slow compared to array iteration -- that's not good. sub isect(@@) { my %h; for my $i (@{$_[0]}) { $h{$i} = 1; } return grep { $h{$_} } @{$_[1]}; }

Skis / Toys / Fun : Array Intersection Bake-off

Fri, 15 May 2009 21:23:27 +0000

Java Version #3 -- turns out like PHP #3 doesn't perform very well and sets a new record... 3992.045 seconds (or 66 minutes, 15 seconds). From the apache commons project... Here's the implementation of intersection, which is great, since you don't have debug your own version... But, probably not going to bring a performance benefit. Collection intersection(final Collection a, final Collection b) { ArrayList list = new ArrayList(); Map mapa = getCardinalityMap(a); Map mapb = getCardinalityMap(b); Set elts = new HashSet(a); elts.addAll(b); Iterator it = elts.iterator(); while(it.hasNext()) { Object obj = it.next(); for(int i=0,m=Math.min(getFreq(obj,mapa),getFreq(obj,mapb));i<m;i++) { list.add(obj); } } return list; }

Skis / Toys / Fun : Array Intersection Bake-off

Fri, 15 May 2009 18:28:04 +0000

Here's a full version of the PHP module... <?php $x = array(); $y = array(); foreach (file("data.txt") as $line) { list($a, $b) = preg_split("/\\s+/", $line); if ($b !== null) { array_push($x, $a); array_push($y, $b); } } $t0 = microtime(true); $xy = isect($x, $y); $t1 = microtime(true); printf("Set | n = %d : %d intersects found in %f seconds\\n", count($x), count($xy), $t1 - $t0); function isect($a, $b) { return array_intersect($a, $b); } Here's the trivial program that creates data.txt #!/usr/bin/python import random LINES = 1000000 MAX = LINES * 5 print LINES for i in range(0, LINES) : print "%s %s" % (random.randint(0, MAX), random.randint(0, MAX))

Skis / Toys / Fun : Array Intersection Bake-off

Fri, 15 May 2009 17:50:53 +0000

You made me think about another case in python -- def isect(a, b) : h = set(a) return [i for i in b if i in h] Which runs in 1.040 seconds -- 30% off the java times. Though of course we're now in the land of python mimicking perl in terms of obfuscation.

Skis / Toys / Fun : Array Intersection Bake-off

Fri, 15 May 2009 17:43:48 +0000

Wow, Here's your PHP rundown, with the addition of #2, #3 V1 = 3.850 V2 = 2.000 V3 = 10.064 Which is interesting to note that array_intersect() is clearly doing something less than good...

Skis / Toys / Fun : iPhone Objective-C bug?

Thu, 16 Apr 2009 22:32:09 +0000

I didn't think I was, isn't "Quiz*" the same as self? @interface Quiz : NSObject { } -(Quiz*)initFromDict: (NSDictionary *)dict; @end

Skis / Toys / Fun : Problem with Tomcat + WAR + ClassPath (help please)?

Fri, 9 Jan 2009 21:54:04 +0000

I could put it there, but was really hoping to leave it in the "public" installed location. I've also got a version that copies it to the XXX.war/WEB-INF/lib directory. But, again I've got two copies...

Skis / Toys / Fun : Web 2.0 development - C++ vs. Java vs. PHP vs. Python

Thu, 16 Oct 2008 20:18:05 +0000

I think I was hinting that XML processing in PHP is easy... the SimpleXML additions to PHP 5 are a breeze to use (similar to the lxml library for Python). Those languages at least deal with a lot of the memory management issues, etc.

Skis / Toys / Fun : Alternative to OpenID

Wed, 15 Oct 2008 16:57:39 +0000

Simple proposal: * Input Email address * lookup hostname in DNS for "v=eaut1 url=http://auth.example.com/?u={user}&d={domain}&...[making up some formatting string] -- similar to SPF http://www.openspf.org/SPF_Record_Syntax * Use that URL to to then do an OpenID transaction to * Now you have a fully authenticated user, using DNS & Email

Skis / Toys / Fun : Alternative to OpenID

Wed, 15 Oct 2008 13:44:01 +0000

That does look interesting and nice to see I'm not the only one thinking this way. Though fundamentally, it should be built into the resolution layer (aka DNS). Not through a 3rd party service like EAUT.

Skis / Toys / Fun : Python Documentation -- Fail!

Fri, 5 Sep 2008 16:29:49 +0000

Nice to see it's documented... But, which is the source of truth? You've now illustrated that they're different... There are advantages to javadoc systems. Where the documentation (online/offline/codeline) are all integrated...

Skis / Toys / Fun : Python vs. Ruby Performance

Tue, 29 Jul 2008 21:42:29 +0000

Not that I track it... But, as I understand Python 2.6 is the end of the road for 2.X and the launching point for Python 3K migrations. Since the performance is consumed by the random package, it illustrates the problem in benchmarks more than languages.

Skis / Toys / Fun : Performance of Python, PHP and Perl

Wed, 11 Jun 2008 14:58:33 +0000

I am aware of the "intention" of the language, but there are times that succinctness is useful. The biggest issue is that if the code ended up being something akin to this bit of perl.. (assuming that you need to extract the match group in each case)

if (/regex_one/) {
} elsif (/regex_two/) {
} elsif (/regex_three/) {
} elsif (/regex_four/) {
} elsif (/regex_five/) {
} elsif (/regex_six/) {
} else {
}

That the Python code would have indented half way across the screen, while the PHP or Perl code would have kept things a bit neater.